Switching converter and its low-voltage starting circuit
A technology for switching converters and low-voltage starting, which is applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., and can solve problems such as the failure of the switching converter 100 to start normally and the failure of the main switching tube Mn to conduct normally. Achieve the effect of avoiding latch-up effect and improving low-voltage start-up ability
Active Publication Date: 2022-05-20
SG MICRO
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Problems solved by technology
[0004] The existing switching converter 100 has the following problems: affected by the threshold voltage of the main switching tube Mn and the parasitic capacitance, the starting voltage of the switching converter 100 is limited. When the DC input voltage Vin is low, due to the The driving voltage comes from the DC input voltage Vin, which will cause the main switching tube Mn to fail to conduct normally, and the switching converter 100 cannot start normally.
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[0020] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0021] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to the other element or there can be intervening elements and the connection between elements can be be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, there are no intervening e...
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The application discloses a switching converter and its low-voltage starting circuit. The low-voltage starting circuit includes a comparator and a substrate voltage control module. The comparator is used to compare the input voltage with a reference voltage, and obtain a voltage detection signal according to the comparison result. The voltage control module is used to adjust the substrate voltage of the main switch tube according to the voltage detection signal, wherein, when the voltage detection signal indicates that the input voltage is less than / equal to the reference voltage, the substrate voltage control module increases the substrate voltage of the main switch tube, and then The conduction threshold of the main switching tube is reduced, the normal conduction of the main switching tube is realized when the input voltage is low, and the low-voltage start-up capability of the switching converter is improved.
Description
technical field [0001] The present invention relates to the technical field of switching power supplies, and more specifically, to a switching converter and a low-voltage starting circuit thereof. Background technique [0002] The switching converter is used to convert the input voltage into a predetermined output voltage to supply the load. An existing switching converter includes a main switching tube, a synchronous switching tube, an inductor and a driving circuit. The drive circuit is used to control the on and off states of the main switching tube and the synchronous switching tube, so that the inductor alternately stores and supplies electric energy, thereby generating an output voltage and / or an output current. [0003] like figure 1 A schematic structural diagram of a switching converter in the prior art is shown. The switching converter adopts Boost topology. The switching converter 100 includes an inductor L1 , a main switch Mn, a synchronous switch Mp, an outp...
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IPC IPC(8): H02M1/36H02M3/158
CPCH02M1/36H02M3/158Y02B70/10H02M1/08H02M1/0006H02M3/156
Inventor 许晶于翔其他发明人请求不公开姓名
Owner SG MICRO